clamming up

Some witnesses who were chatty a few hours after Mr bin Laden was killed seem to be clamming up.

在本·拉登被击毙数小时之后，一些爱讲闲话的目击者似乎也拒不开口了。

You prefer it when others come right out and say what's on their minds rather than clamming up and pretending that everything is okay.

你倾向于别人站出来说他们在想些什么，而不是沉默不语假装万事大吉。

After weeks of surprisingly comprehensive OWS coverage, though, it's now the Chinese media who are clamming up.

在对占领华尔街数周的极其广泛的报道后，现在轮到中国媒体哑口无言了。